<template>
    <div class="goodsinfo-container">

        <transition
        @before-enter="beforeEnter"
        @enter="enter"
        @after-enter="afterEnter"
        >
            <div class="ball" v-show="ballFlag" ref="ball"></div>
        </transition>
        <!-- 商品轮播图区域 -->
        <div class="mui-card">
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    
                    <swiper :lunbotuList="lunbotu" :isfull="false"></swiper>

                </div>
            </div>
        </div>

        <!-- 商品购买区域 -->
        <div class="mui-card">
            <div class="mui-card-header">{{ goodsinfo.title }}</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p class="price">
                        市场价：<del>￥ {{ goodsinfo.market_price}}</del>&nbsp;&nbsp;销售价：<span class="now_price">￥ {{ goodsinfo.sell_price }}</span>
                    </p>
                    <p>购买数量:<numbox @getcount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox></p>

                    
                    <p>
                        <mt-button type="primary" size="small">立即购买</mt-button>
                        <mt-button type="danger" size="small" @click="addToShopCar">加入购物车</mt-button>
                    </p>
                </div>
            </div>
        </div>

        <!-- 商品参数区域 -->
        <div class="mui-card">
            <div class="mui-card-header">商品参数</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p>商品货号：{{ goodsinfo.goods_no }}</p>
                    <p>库存情况：{{ goodsinfo.stock_quantity }}</p>
                    <p>上架时间：{{ goodsinfo.add_time | dataFormat }}</p>
                </div>
            </div>
            <div class="mui-card-footer">
                <mt-button type="primary" size="large" plain @click="goDesc(id)">图文介绍</mt-button>
                <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
            </div>
        </div>

    </div>
</template>

<script>
//导入轮播图组件
import swiper from '../subcomponents/swiper.vue'

import numbox from '../subcomponents/goodsinfo_numberbox.vue'

export default {
    data() {
        return {
            id: this.$route.params.id, //将路由参数对象中的 id 挂载到 data 方便后期调用
            lunbotu: [],
            goodsinfo: {},
            ballFlag: false,
            selectedCount: 1
        };
    },
    created() {
        this.getLunbotu();
        this.getGoodsInfo();
    },
    methods: {
        getLunbotu() {
            this.$http.get("api/getthumimages/" + this.id).then(result => {
                if(result.body.status === 0) {
                    //先循环轮播图数组的每一项，为item添加 img 属性 因为轮播图组件中，只认识 item.img 不认识item.src
                    result.body.message.forEach( item => {
                        item.img = item.src;
                    });

                    this.lunbotu = result.body.message;
                }
            })
        },
        getGoodsInfo() {
            //获取商品的信息 
            this.$http.get('api/goods/getinfo/' + this.id).then(result => {
                if(result.body.status === 0) {
                    this.goodsinfo = result.body.message[0];
                }
            })
        },
        goDesc(id) {
            //点击使用编程式导航
            this.$router.push({ name: 'goodsdesc', params: { id } });
        },
        goComment(id) {
            this.$router.push({ name: 'goodscomment', params: { id } });
        },
        addToShopCar() {
            //添加到购物车
            this.ballFlag = !this.ballFlag;
            //拼接处
            var goodsinfo = { 
                id: this.id,
                count: this.selectedCount,
                price: this.goodsinfo.sell_price,
                selected: true
            };
            //调用store 中的 mutations 来将商品加入购物车
            this.$store.commit('addToCar', goodsinfo);
        },
        beforeEnter(el) {
            el.style.transform="translate(0,0)";
        },
        enter(el, done) {
            el.offsetWidth;
            //获取小球在页面中的位置
            const ballPosition = this.$refs.ball.getBoundingClientRect();
            //获取徽标 在页面中的位置
            const badgePositiopn = document.getElementById("badge").getBoundingClientRect();
            
            const xDist = badgePositiopn.left - ballPosition.left;
            const yDist = badgePositiopn.top - ballPosition.top;
            el.style.transform = `translate(${xDist}px, ${yDist}px)`;
            el.style.transition = "all 1s cubic-bezier(.4,-0.3,1,.68)";
            done();
        },
        afterEnter(el) {
            this.ballFlag = !this.ballFlag;
        },
        getSelectedCount(count) {
            //当子组件把 选中的数量传递给父组件的时候，把选中的值保存到 data上
            this.selectedCount = count;
        }
    },
    components: {
        swiper,
        numbox
    }
}
</script>

<style lang="scss" scoped>
.goodsinfo-container {
    background-color: #eee;
    overflow: hidden;
    .now_price {
        color: red;
    }
    .mui-card-footer {
        display: block;
        button {
            margin: 10px 0;
        }

    }
    .ball {
        width: 15px;height: 15px;border-radius: 50%;position: absolute;background-color: red;z-index: 99;top: 390px;left: 140px;;
    }
}


</style>
